Bug 1493248 - Check for docShell instread on mDocShell, a typo. r=baku

Differential Revision: https://phabricator.services.mozilla.com/D6526

--HG--
extra : moz-landing-system : lando

dom/base/Location.cpp

@@ -170,7 +170,7 @@ Location::GetURI(nsIURI** aURI, bool aGetInnermostURI)
   *aURI = nullptr;
 
   nsCOMPtr<nsIDocShell> docShell(do_QueryReferent(mDocShell));
-  if (!mDocShell) {
+  if (!docShell) {
     return NS_OK;
   }